NCityGraphics|MESH_CULL_FADE_RANGE

this vale is in actual screen percentage, it's used for gradual mesh culling - when the "city's" screen percentage is MESH_CULL_SCREEN_PERCENTAGE or lower all meshes are culled, when it's MESH_CULL_SCREEN_PERCENTAGE + MESH_CULL_FADE_RANGE or higher all meshes are visible